Key Technical Specifications
- Product Model: SPHSS13 (also designated HSS13)
- Manufacturer: ABB (Bailey Controls)
- Product Type: Servo Control Module / Loop Control Card
- System Platform: Bailey INFI 90 Distributed Control System
- Primary Function: Closed-loop hydraulic valve positioning
- Interface: Backplane bus to Multifunction Processor (MFP)
- Target Application: Steam turbine speed and load control
- Form Factor: INFI 90 standard single-slot card
- Signal Type: Analog command / Analog position feedback
- Operating Environment: Industrial power plant control room
Product Introduction
The ABB SPHSS13 is a specialized servo control card designed for the Bailey INFI 90 distributed control system. It acts as the critical interface between the digital controller and physical hydraulic actuators on steam turbines.This module executes high-speed closed-loop positioning algorithms to drive hydraulic servo valves with exact precision. It accepts analog position feedback from the valve and adjusts its output to match the digital command from the MFP. (Always verify the exact revision letter on the existing card’s faceplate, as internal firmware may differ).
Installation & Configuration Guide
Preparation (10 min)
Secure a work order for the turbine control system. Gather a Phillips head screwdriver and an ESD wrist strap. Print the current valve calibration data from the DCS as a baseline.Removal (5–10 min)
Disconnect the field wiring harness from the back of the card. Loosen the two captive faceplate screws. Pull the SPHSS13 straight out of the INFI 90 backplane. Inspect the backplane pins for corrosion.Installation (10 min)
Align the new SPHSS13 with the slot guides. Push firmly and evenly until the card seats fully against the backplane. Tighten the faceplate screws to ensure proper grounding. Reconnect the field wiring harness exactly as documented.Power-On & Test (10 min)
Restore power to the INFI 90 chassis. Check the card status LEDs for normal operation. Access the DCS operator interface and verify the valve position feedback matches the actual physical valve travel. Perform a manual step-test to confirm closed-loop stability.
Troubleshooting Quick Reference
- Valve hunting/oscillating: Check the analog position feedback wiring for noise. Verify the feedback transducer is mechanically tight.
- No valve movement: Measure the 24VDC supply to the servo card. Check the output current at the card terminals.
- Position mismatch: Verify the calibration constants in the DCS logic. Ensure the feedback scaling matches the new card’s factory defaults.
- Card fault LED lit: Check the backplane connection. Reseat the card. If the fault persists, the internal servo amplifier may have failed.
- Slow response time: Inspect the hydraulic fluid condition. A clogged servo valve filter will mimic an electronic control fault.
Dimensions, Mounting & Wiring Notes
- Size: Standard INFI 90 single-width card (approx. 100mm x 160mm)
- Mounting: INFI 90 backplane slot with front-panel faceplate retention
- Wiring: Connects via rear DIN-style field wiring harness. Do not mix up the command and feedback wires.
FAQ
Is this the same as the HSS13?
Yes. SPHSS13 is the commercial ordering code. HSS13 is the technical designation for the Hydraulic Servo Subsystem. They are the same physical card.I need a replacement for a 1998 turbine. Will this work?
It should, but you must check the hardware revision. A 1998 card might be Rev C, while newer stock could be Rev F. Send us a photo of your old card’s barcode label so we can verify compatibility.Do you test these for actual servo control?
Yes. We don’t just check for shorts. We install the SPHSS13 in a live INFI 90 test rack and simulate analog feedback to verify the closed-loop output responds correctly.Can I swap this without shutting down the turbine?
No. This is a critical safety and control component. Valve replacement or card swapping must be done during a planned outage or with a redundant control path verified.What if my DCS shows a bad checksum error?
That usually indicates a backplane communication issue, not necessarily a bad card. Check the MFP module next to it. If the MFP is fine, the SPHSS13 backplane connector might be damaged.Do you have the calibration manual?
We can provide basic installation guidance. For full Bailey INFI 90 servo tuning procedures, refer to your plant’s specific engineering documentation or the original ABB IMHSS03/SPHSS13 hardware manual.
